Lambda1 Tucanae

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Lambda1 Tucanae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Tucana
A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 6.70[2]
B
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 7.35[2]
Characteristics
A
Spectral type F7 IV-V[4]
U−B Template:Engvar +0.07[5]
B−V Template:Engvar +0.55[5]
B
Spectral type G0/2V[4]
Astrometry
A
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: Template:Val[1] mas/yr
Dec.: Template:Val[1] mas/yr
Parallax (π)16.4907±0.0293 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.68[7]
B
Proper motion (μ) RA: Template:Val[3] mas/yr
Dec.: Template:Val[3] mas/yr
Parallax (π)16.5242±0.0361 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
A
Mass1.55[8] Template:Solar mass
Luminosity7[9] Template:Solar luminosity
Surface gravity (log g)3.90[10] cgs
Temperature6,325[10] K
Metallicity [Fe/H]+0.09[10] dex
Age2.6[10] Gyr
B
Mass1.38[8] Template:Solar mass
Radius1.86[3] Template:Solar radius
Luminosity3.534[3] Template:Solar luminosity
Surface gravity (log g)3.94[11] cgs
Temperature5,797[3] K
Metallicity [Fe/H]+0.04[11] dex
Rotational velocity (v sin i)3.6[12] km/s
Other designations
Template:Odlist[13]
A: Template:Odlist[13]
B: Template:Odlist[13]
Database references
SIMBADdata
companion

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Lambda1 Tucanae is the Bayer designation for one member of a pair of stars sharing a common proper motion through space,[8] which lie within the southern constellation of Tucana. As of 2013, the pair had an angular separation of 20.0 arc seconds along a position angle of 82°.[2] Together, they are barely visible to the naked eye with a combined apparent visual magnitude of 6.21.[5] Based upon an annual parallax shift for both stars of approximately 16.5[1][3] mas as seen from Earth, this system is located roughly 198 light years from the Sun.

The brighter member, component A, is a magnitude 6.70[2] F-type star with a stellar classification of F7 IV-V.[4] The luminosity class may indicate that, at the age of 2.6 billion years,[10] it is beginning to evolve away from the main sequence. It has an estimated 1.55[8] times the mass of the Sun and is radiating 7[9] times the solar luminosity from its photosphere at an effective temperature of 6,325 K.[10] The magnitude 7.35[2] companion, component B, has 1.38[8] times the mass of the Sun. If the pair are gravitationally bound, then their estimated orbital period is 27,000 years.[8]

References

Template:Reflist

Template:Stars of Tucana

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Gaia DR2 A
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named WDSC2014
  3. ↑ a b c d e f g h i Cite error: Invalid <ref> tag; no text was provided for refs named Gaia DR2 B
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named houk1979
  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Cousins1971
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  8. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Tokovinin2014
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Mcdonald2012
  10. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Casagrande2011
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named cassagrande2011
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named globocki2005
  13. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Simbad
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